M2.8 earthquake 10 km NNE of Cantwell, Alaska

A magnitude 2.8 earthquake struck 10 km NNE of Cantwell, Alaska on Fri, Sep 25, 2020, 5:43 AM AKDT (13:43 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M3.7 63 km N of Chase, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
2.8	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
3.0	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.027 · 182 stations

3 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 140 in the 60 days after this one and 74 in the 30 days before it.

The first 60 of 140.

From the USGS Earthquake Hazards Program and its partner networks, event ak020cd3k8vi (also filed as us6000c156). Read Sat, Oct 3, 2026, 6:42 AM UTC.